package com.yupi.yuojcodesandbox;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.resource.ResourceUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.dfa.WordTree;
import com.yupi.yuojcodesandbox.model.ExecuteCodeRequest;
import com.yupi.yuojcodesandbox.model.ExecuteCodeResponse;
import com.yupi.yuojcodesandbox.model.ExecuteMessage;
import com.yupi.yuojcodesandbox.model.JudgeInfo;
import com.yupi.yuojcodesandbox.utils.ProcessUtils;

import java.io.File;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;

/**
 * @Author: wenjupeng
 * @Date: 2025/01/20/10:38
 * @Description:
 * @Param:
 * @return:
 */
public class JavaNativeCodeSandboxOld implements CodeSandbox {
    private static final String GLOBAL_CODE_DIR_NAME = "tmpCode";
    private static final String GLOBAL_JAVA_CLASS_NAME = "Main.java";
    private static final long TIME_OUT = 5000L;
    private static final String SECURITY_MANAGER_PATH = "E:\\D_soft\\learn_soft\\IDEA2023\\OJ_space\\yuoj-code-sandbox\\src\\main\\resources\\security";
    
    //安全管理器
    private static final String SECURITY_MANAGER_CLASS_NAME = "MySecurityManager";
    private static final List<String> blackList = Arrays.asList("Files", "exec");
    
    private static final WordTree WORD_TREE;
    
    static {
        // 初始化字典树
        WORD_TREE = new WordTree();
        WORD_TREE.addWords(blackList);
    }
    
    public static void main(String[] args) {
        JavaNativeCodeSandboxOld javaNativeCodeSandbox = new JavaNativeCodeSandboxOld();
        ExecuteCodeRequest executeCodeRequest = new ExecuteCodeRequest();
        executeCodeRequest.setInputList(Arrays.asList("1 2","3 4"));
        //读取代码文件
        //String code = ResourceUtil.readStr("testCode/simpleCompute/Main.java", StandardCharsets.UTF_8);
//        String code = ResourceUtil.readStr("testCode/unsafeCode/ReadFileError.java", StandardCharsets.UTF_8);
        String code = ResourceUtil.readStr("testCode/unsafeCode/RunFileError.java", StandardCharsets.UTF_8);
        
        
        //String code = ResourceUtil.readStr("testCode/simpleComputeArgs/Main.java", StandardCharsets.UTF_8);
        
        executeCodeRequest.setCode(code);
        executeCodeRequest.setLanguage("java");
        //输入请求，拿出响应
        ExecuteCodeResponse executeCodeResponse = javaNativeCodeSandbox.executeCode(executeCodeRequest);
        System.out.println(executeCodeResponse);
        
    }
    @Override
    public ExecuteCodeResponse executeCode(ExecuteCodeRequest executeCodeRequest) {
        //System.setSecurityManager(new DenySecurityManager());
        List<String> inputList = executeCodeRequest.getInputList();
        String code = executeCodeRequest.getCode();
        String language = executeCodeRequest.getLanguage();
        
        //校验代码中是否包含黑白名单中的命令
//        FoundWord foundWord = WORD_TREE.matchWord(code);
//        if(foundWord != null){
//            System.out.println("包含禁止词："+foundWord.getFoundWord());
//            return null;
//        }
//      1.把用户的代码保存为文件
        //获取项目根目录
        String userDir = System.getProperty("user.dir");//yuoj-code-sandbox
        String globalCodePathName = userDir + File.separator + GLOBAL_CODE_DIR_NAME;//File.separator这个相当于反斜杠，由于windos和MAC不一样，所以用这个File.separator
        //判断全局代码目录是否存在，没有则新建
        if(!FileUtil.exist(globalCodePathName)){
            FileUtil.mkdir(globalCodePathName);
        }
        //把用户的代码隔离存放，因为每一个代码的名字都是Main.java
        String userCodeParentPath = globalCodePathName + File.separator + UUID.randomUUID();
        String userCodePath = userCodeParentPath + File.separator + GLOBAL_JAVA_CLASS_NAME;
        File userCodeFile = FileUtil.writeString(code,userCodePath, StandardCharsets.UTF_8);
        
        // 2.编译代码，得到class文件
        String compileCmd = String.format("javac -encoding utf-8 %s",userCodeFile.getAbsolutePath());
        try {
            Process compileProcess = Runtime.getRuntime().exec(compileCmd);
            ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(compileProcess, "编译");
            System.out.println(executeMessage);
        } catch (Exception e) {
            return getErrorResponse(e);
        }
        //        3.执行代码，得到输出结果
        List<ExecuteMessage> executeMesssageList = new ArrayList<>();
        for (String inputArgs : inputList) {
            //String runCmd = String.format("java -Xmx256m -Dfile.encoding=UTF-8 -cp %s Main %s",userCodeParentPath,inputArgs);
            String runCmd = String.format("java -Xmx256m -Dfile.encoding=UTF-8 -cp %s;%s -Djava.security.manager=%s Main %s", userCodeParentPath, SECURITY_MANAGER_PATH, SECURITY_MANAGER_CLASS_NAME, inputArgs);
            try {
                Process runProcess = Runtime.getRuntime().exec(runCmd);
                //超时控制
                //创建一个新的线程，在程序执行开始前，我这个线程先睡眠一会，如果我睡醒了，你还在执行就把你杀掉，进行超市控制。
                new Thread(()->{
                    try {
                        Thread.sleep(TIME_OUT);
                        System.out.println("超时了，中断");
                        runProcess.destroy();
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }).start();
                ExecuteMessage executeMessage = ProcessUtils.runProcessAndGetMessage(runProcess, "运行");
               // ExecuteMessage executeMessage1 = ProcessUtils.runInteractProcessAndGetMessage(runProcess, inputArgs);
                System.out.println(executeMessage);
            } catch (Exception e) {
                return getErrorResponse(e);
            }
        }
        
        //4.收集整理输出结果
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        List<String> outputList = new ArrayList<>();
        //取用时最大值，便于判断是否超时
        long maxTime = 0;  //判断如果有一个超时，能够证明有问题
        for (ExecuteMessage executeMessage : executeMesssageList) {
            String errorMessage = executeMessage.getErrorMessage();
            if(StrUtil.isNotBlank(errorMessage)){
                executeCodeResponse.setMessage(errorMessage);
                //用户提交的代码执行中存在错误:3
                executeCodeResponse.setStatus(3);
                break;
            }
            outputList.add(executeMessage.getMessage());
            Long time = executeMessage.getTime();
            if(time != null){
                maxTime = Math.max(maxTime,time);
                
            }
        }
        //正常运行完成
        if(outputList.size() == executeMesssageList.size()){
            executeCodeResponse.setStatus(1);
        }
        executeCodeResponse.setOutputList(outputList);
        JudgeInfo judgeInfo = new JudgeInfo();
        judgeInfo.setTime(maxTime);
        //要借助第三方库来获取内存占用，非常麻烦，此处不做实现
        //judgeInfo.setMemory();
        executeCodeResponse.setJudgeInfo(judgeInfo);
        
        //5.文件清理
        if(userCodeFile.getParentFile() != null){
            boolean del = FileUtil.del(userCodeParentPath);
            System.out.println("删除"+(del ? "成功" : "失败"));
        }
        return executeCodeResponse;
    }
    
    /**
     * 封装一个获取错误响应类
     * @param e
     * @return
     */
    private ExecuteCodeResponse getErrorResponse(Throwable e){
        ExecuteCodeResponse executeCodeResponse = new ExecuteCodeResponse();
        executeCodeResponse.setOutputList(new ArrayList<>());
        executeCodeResponse.setMessage(e.getMessage());
        executeCodeResponse.setStatus(2);
        executeCodeResponse.setJudgeInfo(new JudgeInfo());
        return executeCodeResponse;
        
    }
    
}























